# US 10,483,755 B2 · Display device including power converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,483,755 B2 - Document ID: US10483755B2 - Status: Granted - Kind: B2 - Application number: 15/611,251 - Filed: 2017-06-01 - Published: 2017-09-21 - Granted: 2019-11-19 - Earliest claimed: 2010-11-23 - Assignees: Samsung Display Co., Ltd. - Applicants: Samsung Display Co., Ltd. - Inventors: Sung-Cheon Park - Web page: https://patentgrep.com/patent/US10483755B2 ## CPC - G09G 3/006: {Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays (testing individual LED's G01R31/2635; testing lamps G01R31/44; testing of optical features of LCD displays G02F1/1309)} - G09G 3/32: semiconductive, e.g. using light-emitting diodes [LED] - G09G 3/3696: {Generation of voltages supplied to electrode drivers} - H02H 9/02: responsive to excess current {(current limitation for voltage regulators G05F1/573; disconnection after limiting H02H3/025)} - H05B 45/50: responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits - G09G 2310/0289: Details of voltage level shifters arranged for use in a driving circuit - G09G 2330/00: Aspects of power supply; Aspects of display protection and defect management - G09G 2330/028: Generation of voltages supplied to electrode drivers in a matrix display other than LCD - H05B 45/60: Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED] - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL ## Abstract A power converter includes a voltage conversion unit that provides a first driving voltage at a first output electrode by converting a power supply voltage in response to a first control signal, the voltage conversion unit being configured to provide a second driving voltage at a second output electrode by converting the power supply voltage after a short detection period, the voltage conversion unit being configured to shut down in response to a third control signal, and a short detection unit that generates the third control signal by comparing a magnitude of a voltage of the second output electrode with a magnitude of a reference voltage during the short detection period. ## Claims ### Claim 1 A display device, comprising: a display panel including a plurality of pixels, the pixels being configured to operate in response to a first driving voltage, a second driving voltage, and a data signal; a voltage converter that provides the first driving voltage to the display panel through first wiring and the second driving voltage to the display panel through second wiring and controls a length of a detection period, the voltage converter selectively starting an output of the second driving voltage after the detection period, the detection period being after an output of the first driving voltage; and a detector configured to control the output of the first and second driving voltages of the voltage converter based on a magnitude of a wiring voltage corresponding to voltage on the second wiring. ### Claim 2 (depends on 1) The display device as claimed in claim 1, wherein the detector compares a reference voltage with the wiring voltage corresponding to the voltage on the second wiring in the detection period and selectively starts the output of the second driving voltage depending on a comparison result. ### Claim 3 (depends on 2) The display device as claimed in claim 2, wherein the voltage converter controls the length of the detection period based on a length of a time period from a time when the first driving voltage is output to a time when the first driving voltage reaches a target voltage. ### Claim 4 (depends on 3) The display device as claimed in claim 3, wherein the length of the detection period is proportional to the time period from the time when the first driving voltage is output to the time when the first driving voltage reaches the target voltage. ### Claim 5 (depends on 2) The display device as claimed in claim 2, wherein the detector selectively outputs the comparison result with a first level or a second level depending on relative magnitudes of the wiring voltage and the reference voltage, and the voltage converter starts the output of the second driving voltage if the comparison result has the first level when evaluated by the voltage converter. ### Claim 6 (depends on 5) The display device as claimed in claim 5, wherein the voltage converter shuts down output of the first driving voltage if the comparison result has the second level when evaluated by the voltage converter. ### Claim 7 (depends on 6) The display device as claimed in claim 6, wherein the comparison result has the second level if the wiring voltage corresponding to the voltage on the second wiring is between the reference voltage and the first driving voltage. ### Claim 8 A display device, comprising: a display panel including a plurality of pixels, the pixels being configured to operate in response to a first driving voltage, a second driving voltage, and a data signal; a voltage converter that generates the first and second driving voltages and provides the first driving voltage to the display panel through first wiring and the second driving voltage to the display panel through second wiring; and a detector configured to control the generation of the first and second driving voltages of the voltage converter based on a magnitude of a wiring voltage corresponding to voltage on the second wiring, wherein the voltage converter controls a length of a detection period, the detection period being after an output of the first driving voltage. ### Claim 9 (depends on 8) The display device as claimed in claim 8, wherein the voltage converter selectively starts an output of the second driving voltage after the detection period. ### Claim 10 (depends on 9) The display device as claimed in claim 9, wherein the detector compares a reference voltage with the wiring voltage corresponding to the voltage on the second wiring in the detection period and selectively starts the output of the second driving voltage depending on a comparison result. ### Claim 11 (depends on 10) The display device as claimed in claim 10, wherein the detector selectively outputs the comparison result with a first level or a second level depending on relative magnitudes of the wiring voltage and the reference voltage, and starts the output of the second driving voltage if the comparison result has the first level when evaluated by the voltage converter. ### Claim 12 (depends on 11) The display device as claimed in claim 11, wherein the voltage converter shuts down the output of the first driving voltage if the comparison result has the second level when evaluated by the voltage converter. ### Claim 13 (depends on 12) The display device as claimed in claim 12, wherein the comparison result has the second level if the wiring voltage corresponding to the voltage on the second wiring is between the reference voltage and the first driving voltage. ### Claim 14 (depends on 8) The display device as claimed in claim 8, wherein the voltage converter controls the length of the detection period based on a length of a time period from a time when the first driving voltage is output to a time when the first driving voltage reaches a target voltage.